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Octavian Purdila0bf54fc2016-07-08 19:13:13 +03001/*
2 * ACPI configfs support
3 *
4 * Copyright (c) 2016 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
Octavian Purdila612bd012016-07-08 19:13:14 +030011#define pr_fmt(fmt) "ACPI configfs: " fmt
12
Octavian Purdila0bf54fc2016-07-08 19:13:13 +030013#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/configfs.h>
16#include <linux/acpi.h>
17
Octavian Purdila612bd012016-07-08 19:13:14 +030018static struct config_group *acpi_table_group;
19
20struct acpi_table {
21 struct config_item cfg;
22 struct acpi_table_header *header;
23};
24
25static ssize_t acpi_table_aml_write(struct config_item *cfg,
26 const void *data, size_t size)
27{
28 const struct acpi_table_header *header = data;
29 struct acpi_table *table;
30 int ret;
31
32 table = container_of(cfg, struct acpi_table, cfg);
33
34 if (table->header) {
35 pr_err("table already loaded\n");
36 return -EBUSY;
37 }
38
39 if (header->length != size) {
40 pr_err("invalid table length\n");
41 return -EINVAL;
42 }
43
44 if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
45 pr_err("invalid table signature\n");
46 return -EINVAL;
47 }
48
49 table = container_of(cfg, struct acpi_table, cfg);
50
51 table->header = kmemdup(header, header->length, GFP_KERNEL);
52 if (!table->header)
53 return -ENOMEM;
54
55 ret = acpi_load_table(table->header);
56 if (ret) {
57 kfree(table->header);
58 table->header = NULL;
59 }
60
61 return ret;
62}
63
64static inline struct acpi_table_header *get_header(struct config_item *cfg)
65{
66 struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
67
68 if (!table->header)
69 pr_err("table not loaded\n");
70
71 return table->header;
72}
73
74static ssize_t acpi_table_aml_read(struct config_item *cfg,
75 void *data, size_t size)
76{
77 struct acpi_table_header *h = get_header(cfg);
78
79 if (!h)
80 return -EINVAL;
81
82 if (data)
83 memcpy(data, h, h->length);
84
85 return h->length;
86}
87
88#define MAX_ACPI_TABLE_SIZE (128 * 1024)
89
90CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);
91
92struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
93 &acpi_table_attr_aml,
94 NULL,
95};
96
97ssize_t acpi_table_signature_show(struct config_item *cfg, char *str)
98{
99 struct acpi_table_header *h = get_header(cfg);
100
101 if (!h)
102 return -EINVAL;
103
104 return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature);
105}
106
107ssize_t acpi_table_length_show(struct config_item *cfg, char *str)
108{
109 struct acpi_table_header *h = get_header(cfg);
110
111 if (!h)
112 return -EINVAL;
113
114 return sprintf(str, "%d\n", h->length);
115}
116
117ssize_t acpi_table_revision_show(struct config_item *cfg, char *str)
118{
119 struct acpi_table_header *h = get_header(cfg);
120
121 if (!h)
122 return -EINVAL;
123
124 return sprintf(str, "%d\n", h->revision);
125}
126
127ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str)
128{
129 struct acpi_table_header *h = get_header(cfg);
130
131 if (!h)
132 return -EINVAL;
133
134 return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
135}
136
137ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str)
138{
139 struct acpi_table_header *h = get_header(cfg);
140
141 if (!h)
142 return -EINVAL;
143
144 return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
145}
146
147ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str)
148{
149 struct acpi_table_header *h = get_header(cfg);
150
151 if (!h)
152 return -EINVAL;
153
154 return sprintf(str, "%d\n", h->oem_revision);
155}
156
157ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg, char *str)
158{
159 struct acpi_table_header *h = get_header(cfg);
160
161 if (!h)
162 return -EINVAL;
163
164 return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
165}
166
167ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
168 char *str)
169{
170 struct acpi_table_header *h = get_header(cfg);
171
172 if (!h)
173 return -EINVAL;
174
175 return sprintf(str, "%d\n", h->asl_compiler_revision);
176}
177
178CONFIGFS_ATTR_RO(acpi_table_, signature);
179CONFIGFS_ATTR_RO(acpi_table_, length);
180CONFIGFS_ATTR_RO(acpi_table_, revision);
181CONFIGFS_ATTR_RO(acpi_table_, oem_id);
182CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
183CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
184CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
185CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
186
187struct configfs_attribute *acpi_table_attrs[] = {
188 &acpi_table_attr_signature,
189 &acpi_table_attr_length,
190 &acpi_table_attr_revision,
191 &acpi_table_attr_oem_id,
192 &acpi_table_attr_oem_table_id,
193 &acpi_table_attr_oem_revision,
194 &acpi_table_attr_asl_compiler_id,
195 &acpi_table_attr_asl_compiler_revision,
196 NULL,
197};
198
199static struct config_item_type acpi_table_type = {
200 .ct_owner = THIS_MODULE,
201 .ct_bin_attrs = acpi_table_bin_attrs,
202 .ct_attrs = acpi_table_attrs,
203};
204
205static struct config_item *acpi_table_make_item(struct config_group *group,
206 const char *name)
207{
208 struct acpi_table *table;
209
210 table = kzalloc(sizeof(*table), GFP_KERNEL);
211 if (!table)
212 return ERR_PTR(-ENOMEM);
213
214 config_item_init_type_name(&table->cfg, name, &acpi_table_type);
215 return &table->cfg;
216}
217
218struct configfs_group_operations acpi_table_group_ops = {
219 .make_item = acpi_table_make_item,
220};
221
222static struct config_item_type acpi_tables_type = {
223 .ct_owner = THIS_MODULE,
224 .ct_group_ops = &acpi_table_group_ops,
225};
226
Octavian Purdila0bf54fc2016-07-08 19:13:13 +0300227static struct config_item_type acpi_root_group_type = {
228 .ct_owner = THIS_MODULE,
229};
230
231static struct configfs_subsystem acpi_configfs = {
232 .su_group = {
233 .cg_item = {
234 .ci_namebuf = "acpi",
235 .ci_type = &acpi_root_group_type,
236 },
237 },
238 .su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
239};
240
241static int __init acpi_configfs_init(void)
242{
243 int ret;
244 struct config_group *root = &acpi_configfs.su_group;
245
246 config_group_init(root);
247
248 ret = configfs_register_subsystem(&acpi_configfs);
249 if (ret)
250 return ret;
251
Octavian Purdila612bd012016-07-08 19:13:14 +0300252 acpi_table_group = configfs_register_default_group(root, "table",
253 &acpi_tables_type);
254 return PTR_ERR_OR_ZERO(acpi_table_group);
Octavian Purdila0bf54fc2016-07-08 19:13:13 +0300255}
256module_init(acpi_configfs_init);
257
258static void __exit acpi_configfs_exit(void)
259{
Octavian Purdila612bd012016-07-08 19:13:14 +0300260 configfs_unregister_default_group(acpi_table_group);
Octavian Purdila0bf54fc2016-07-08 19:13:13 +0300261 configfs_unregister_subsystem(&acpi_configfs);
262}
263module_exit(acpi_configfs_exit);
264
265MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
266MODULE_DESCRIPTION("ACPI configfs support");
267MODULE_LICENSE("GPL v2");